Posted by Dave Hill on September 14, 2009, 8:43 pm
Year of Manufacture *: 2000 Engine Code or Type *: 1.3 HCS (OHV) ( Optional ) Scanner used: IDS Autodiagnos & Snap-on
Evening all
I have a year 2000 Ford KA that came to me with a bad hesitation. This motor employs a TMAP set-up, as opposed to the MAF type as seen on the earlier ones.
No fault codes were present, but live data showed an issue with the intake air temperature. At 123 degrees C, it was clear that something was a miss. After supplying a substitute voltage of approx 3.0v (from memory) the scan tool showed a more plausible, 20 degrees & the engine revs sweet.
We were lucky enough to have a donor car available & a swap of the TMAP was made. The readings were just the same, so I checked the data on the donor car & it was a plausible 18 degrees.
I have a good ground & a 5 volt feed & two output signals (MAP & IAT). Continuity & short tests checked out ok. I have even re wired from the TMAP to the PCM using new terminals (to eliminate the TMAP connector) & the readings are just the same.
It seemed fair to blame the ECU at this point, so I obtained a second hand unit (with key & antenna). Guess what! Its still got the same high IAT (Intake Air Temp) readings
I am starting to clutch at straws now & I am wondering if this has had an ECU swap previously. I sourced my replacement, based on the part number on the unit in the car. What if someone had previously "chucked" any old ECU on it, that was at hand? Would that even work?
The engine looks like the original & the wiring harness doesn't look like its been messed with.
Anyone else ever seen this?
Cheers
Dave
PS. As an interesting side note. Non of my scan tools have a PID (Parameter Identification) for the MAP value on this (Not even IDS). It could be the case that the MAP readings are screwy also, but with no way to view them ARRRRRGGG!
Re: Ford KA 1.3 Flat Spot.
Posted by Lee Mackintosh on September 15, 2009, 6:35 pm, in reply to "Ford KA 1.3 Flat Spot." Lee Mackintosh
Dave,
from a wiring diagram that i have it looks as if the 5 volt supply is to both the T-Map sensor and the TP sensor, also i think the ground supply is linkied to various components.
I'd think a supply fault would cause faults with more than one component and log a code.
Re: Ford KA 1.3 Flat Spot.
Posted by tony bickers on September 15, 2009, 8:29 pm, in reply to "Re: Ford KA 1.3 Flat Spot." Tony Bickers
Has this had the mod for rev flare between gearchanges? One of the first I did many years ago induced a further fault because as Lee says the ground or it may have been a feed, I can't remember, is connected to several components, I think I missed a splice into the ground/live circuit when I by-passed the bulkhead multiplug which gave a similar response to your car.Was a long while ago but maybe worth considering?
Fixed #
Posted by Dave Hill on September 16, 2009, 12:56 pm, in reply to "Re: Ford KA 1.3 Flat Spot." Message modified by board administrator September 17, 2009, 2:05 pm
Thanks for the replies fella's
I did consider the "TPS Throttle Flare" MOD as a possible reason for my issue, that is why I hard wired it direct from the TMAP to the PCM, to eliminate any outside influences.
Anyways, I rang the dealer for some numbers for the correct ECU for this car & they confirmed that the one I had on the car, was in fact for a 1998 KA & as we know, they have a MAF system.
I managed to swap the second hand one for the right unit & hety presto Job done!
For the record the relavant numbers are.....
LPE 322 (BACA in big letters) is for the TMAP type. LPE 627 (AREA in big letters) is for the MAF type
on September 15, 2009, 6:35 pm, in reply to "